<template>
    <div ref="bsWrap" class="h-full text-left">
        <div ref="bsContent" class="inline-block" :class="{ 'h-full': !isScrollY }">
            <slot></slot>
        </div>
    </div>
</template>

<script setup>
import { computed, onMounted, ref, watch } from 'vue'
import { useElementSize } from '@vueuse/core'
import BScroll from '@better-scroll/core'

defineOptions({ name: 'BetterScroll' })

const props = defineProps({
    /** better-scroll的配置: https://better-scroll.github.io/docs/zh-CN/guide/base-scroll-options.html */
    options: {
        type: Object,
        required: true
    }
})

const bsWrap = ref()
const instance = ref()
const bsContent = ref()
const isScrollY = computed(() => Boolean(props.options.scrollY))

function initBetterScroll() {
    if (!bsWrap.value) return
    instance.value = new BScroll(bsWrap.value, props.options)
}

// 滚动元素发生变化，刷新BS
const { width: wrapWidth } = useElementSize(bsWrap)
const { width, height } = useElementSize(bsContent)
watch([() => wrapWidth.value, () => width.value, () => height.value], () => {
    if (instance.value) {
        instance.value.refresh()
    }
})

onMounted(() => {
    initBetterScroll()
})

defineExpose({ instance })
</script>

<style scoped></style>
